湖泊的富营养化现象主要表现为()
A.赤潮
B.水华
C.水质发黑
D.形成岸边污染带
E.水生生物大量繁殖
参考答案:B
鼠疫是一种烈性传染病,其传染性强,传播速度快,病死率高。在我国法定传染病中列为()传染病。
A.甲类
B.乙类
Which of the following is not a contributing factor to unstable blood sugars in the neonate
A.Prematurity.
B.Respiratory distress.
C.Postdated infant.
D.Cesarean delivery.